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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,207 @@ | ||
| // Copyright 2018 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package aggfuncs | ||
|
|
||
| import ( | ||
| "github.com/juju/errors" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| ) | ||
|
|
||
| // All the following avg function implementations return the decimal result, | ||
| // which store the partial results in "partialResult4AvgDecimal". | ||
| // | ||
| // "baseAvgDecimal" is wrapped by: | ||
| // - "avgOriginal4Decimal" | ||
| // - "avgPartial4Decimal" | ||
| type baseAvgDecimal struct { | ||
| baseAggFunc | ||
| } | ||
|
|
||
| type partialResult4AvgDecimal struct { | ||
| sum types.MyDecimal | ||
| count int64 | ||
| } | ||
|
|
||
| func (e *baseAvgDecimal) AllocPartialResult() PartialResult { | ||
| return PartialResult(&partialResult4AvgDecimal{}) | ||
| } | ||
|
|
||
| func (e *baseAvgDecimal) ResetPartialResult(pr PartialResult) { | ||
| p := (*partialResult4AvgDecimal)(pr) | ||
| p.sum = *types.NewDecFromInt(0) | ||
| p.count = int64(0) | ||
| } | ||
|
|
||
| func (e *baseAvgDecimal) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { | ||
| p := (*partialResult4AvgDecimal)(pr) | ||
| if p.count == 0 { | ||
| chk.AppendNull(e.ordinal) | ||
| return nil | ||
| } | ||
| decimalCount := types.NewDecFromInt(p.count) | ||
| finalResult := new(types.MyDecimal) | ||
| err := types.DecimalDiv(&p.sum, decimalCount, finalResult, types.DivFracIncr) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| chk.AppendMyDecimal(e.ordinal, finalResult) | ||
| return nil | ||
| } | ||
|
|
||
| type avgOriginal4Decimal struct { | ||
| baseAvgDecimal | ||
| } | ||
|
|
||
| func (e *avgOriginal4Decimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4AvgDecimal)(pr) | ||
| newSum := new(types.MyDecimal) | ||
| for _, row := range rowsInGroup { | ||
| input, isNull, err := e.args[0].EvalDecimal(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
|
|
||
| err = types.DecimalAdd(&p.sum, input, newSum) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| p.sum = *newSum | ||
| p.count++ | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| type avgPartial4Decimal struct { | ||
| baseAvgDecimal | ||
| } | ||
|
|
||
| func (e *avgPartial4Decimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4AvgDecimal)(pr) | ||
| newSum := new(types.MyDecimal) | ||
| for _, row := range rowsInGroup { | ||
| inputSum, isNull, err := e.args[1].EvalDecimal(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
|
|
||
| inputCount, isNull, err := e.args[0].EvalInt(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
|
|
||
| err = types.DecimalAdd(&p.sum, inputSum, newSum) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| p.sum = *newSum | ||
| p.count += inputCount | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // All the following avg function implementations return the float64 result, | ||
| // which store the partial results in "partialResult4AvgFloat64". | ||
| // | ||
| // "baseAvgFloat64" is wrapped by: | ||
| // - "avgOriginal4Float64" | ||
| // - "avgPartial4Float64" | ||
| type baseAvgFloat64 struct { | ||
| baseAggFunc | ||
| } | ||
|
|
||
| type partialResult4AvgFloat64 struct { | ||
| sum float64 | ||
| count int64 | ||
| } | ||
|
|
||
| func (e *baseAvgFloat64) AllocPartialResult() PartialResult { | ||
| return (PartialResult)(&partialResult4AvgFloat64{}) | ||
| } | ||
|
|
||
| func (e *baseAvgFloat64) ResetPartialResult(pr PartialResult) { | ||
| p := (*partialResult4AvgFloat64)(pr) | ||
| p.sum = 0 | ||
| p.count = 0 | ||
| } | ||
|
|
||
| func (e *baseAvgFloat64) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { | ||
| p := (*partialResult4AvgFloat64)(pr) | ||
| if p.count == 0 { | ||
| chk.AppendNull(e.ordinal) | ||
| } else { | ||
| chk.AppendFloat64(e.ordinal, p.sum/float64(p.count)) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| type avgOriginal4Float64 struct { | ||
| baseAvgFloat64 | ||
| } | ||
|
|
||
| func (e *avgOriginal4Float64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4AvgFloat64)(pr) | ||
| for _, row := range rowsInGroup { | ||
| input, isNull, err := e.args[0].EvalReal(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
|
|
||
| p.sum += input | ||
| p.count++ | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| type avgPartial4Float64 struct { | ||
| baseAvgFloat64 | ||
| } | ||
|
|
||
| func (e *avgPartial4Float64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4AvgFloat64)(pr) | ||
| for _, row := range rowsInGroup { | ||
| inputSum, isNull, err := e.args[1].EvalReal(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
|
|
||
| inputCount, isNull, err := e.args[0].EvalInt(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
|
|
||
| p.sum += inputSum | ||
| p.count += inputCount | ||
| } | ||
| return nil | ||
| } |
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